package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSONObject;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(urlPatterns = "/*")
@Slf4j
public class LockCheckLogin implements Filter {
    //路径匹配符,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        long id = Thread.currentThread().getId();
        log.info("线程id:{}",id);
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String url = request.getRequestURI();
        log.info("拦截到请求:{}",url);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/upload",
                "/common/download",
                "/user/sendMsg",
                "/user/login",
                "/user/loginout"
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, url);
        //3、如果不需要处理，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!= null){
            log.info("用户已登录,id为:{}",request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
        if (request.getSession().getAttribute("user")!= null){
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        R<String> notlogin = R.error("NOTLOGIN");
        String s = JSONObject.toJSONString(notlogin);
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(s);
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param url
     * @return
     */
    private boolean check(String[] urls,String url) {
        for (String s : urls) {
            boolean match = PATH_MATCHER.match(s, url);
            if (match){
                return true;
            }
        }
        return false;
    }
}
